孤岛光伏并联逆变器系统的固定时间模糊反步控制策略  

Fixed-time fuzzy backstepping control strategy for islanded photovoltaic parallel inverters

作　　者：何国锋 周子淳 张国勇 李国娇 HE Guofeng;ZHOU Zichun;ZHANG Guoyong;LI Guojiao(School of Electrical and Control Engineering,Henan University of Urban Construction,Pingdingshan 467036,China;College of Electrical Engineering&New Energy,China Three Gorges University,Yichang 443002,China)

机构地区：[1]河南城建学院电气与控制工程学院,河南平顶山467036 [2]三峡大学电气与新能源学院,湖北宜昌443002

出　　处：《电力系统保护与控制》2023年第18期147-156,共10页Power System Protection and Control

基　　金：河南省自然科学基金面上项目资助(222300420400)。

摘　　要：针对孤岛光伏并联逆变器系统存在固有的建模不确定性以及动态性能差的问题,提出一种固定时间模糊反步控制策略。首先,将滤波器参数和输出电流作为未知项,建立含有滤波器参数摄动和输出电流扰动的单台逆变器等效数学模型。其次,将固定时间Lyapunov稳定性原理、模糊逻辑控制理论和反步控制理论相结合,利用固定时间模糊反步控制器逼近系统中的未知项,以改善逆变器的输出电压。然后,基于严格的Lyapunov定理证明所提控制策略下的系统是固定时间稳定的,且稳定时间的上界与系统的初始状态无关。最后,通过两台20 kW样机验证了所提控制策略的有效性。There is an inherent modeling uncertainty and also poor dynamic performance of islanded photovoltaic parallel inverter systems.Thus a fixed-time fuzzy backstepping control strategy is proposed.First,the filter parameters and output current are regarded as unknown terms,and the equivalent mathematical model of a single inverter with filter parameter perturbation and output current disturbance is established.Second,the fixed-time Lyapunov stability principle,fuzzy logic and backstepping control theories are combined,and the fixed-time fuzzy backstepping controller is used to approximate the unknown terms in the system to improve the output voltage of the inverter.Then,based on the strict Lyapunov theorem,the system is proved to be fixed-time stable with the proposed control strategy,and the upper bound of the stable time is independent of the initial state of the system.Finally,the effectiveness of the proposed control strategy is verified by two prototypes of 20 kW parallel inverters.

关 键 词：孤岛模式 并联逆变器 固定时间控制 模糊控制 反步控制 

分 类 号：TM464[电气工程—电器] TP273[自动化与计算机技术—检测技术与自动化装置]